package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.result.Result;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /*
    * 增加购物车
    * */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入购物车的商品是否已经存在
        ShoppingCart shoppingCart =new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果已经存在，就执行修改语句，将数量加一
        if (list != null && list.size()>0)
        {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1); //update shopping_cart ser number =? where id =?
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //如果不存在,需要插入一条购物车数据
            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null)
            {
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                //本次添加的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            //插入增加购物车
            shoppingCartMapper.insert(shoppingCart);
        }
    }
    /*
    *
    * 查看购物车
    * */
    public List<ShoppingCart> shoppingCart() {
        //获得微信用户id
        Long userId = BaseContext.getCurrentId();
         ShoppingCart shoppingCart= ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list= shoppingCartMapper.list(shoppingCart);
         return list;
    }
    /*
    * 减少购物车中的一个商品
    * */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
       //使用完整的对象来接收
        ShoppingCart shoppingCart=new ShoppingCart();
        //对象拷贝
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，就是根据微信用户id来查
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //先查询，如果有数据，判断是否大于一，大于一就减一(执行修改语句),如果等于1就直接删除
        if (list !=null && list.size()>0 )
        {
            //如果有数据就拿出第一条数据
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            if (number==1)
            {
                //购物车只有一份的时候我们直接删除
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //购物车里面有多份,就执行修改语句
                shoppingCart.setNumber(shoppingCart.getNumber()-1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }


    }
    /*
    * 清空购物车
    * */
    public void clearShoppingCart() {
        //获取用户id
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }
}
